Basic File upload in GWT
- by Maksim
I'm trying to figure out how to upload one file using GWTs FileUpload widget. I'm using GWT and Google AppEngine with Java but I would like to upload file to my own Linux server.
I have the following code already but now I can't figure out how to submit my file to the Google AppServer server and save it to another server:
public class FileUploader{
private ControlPanel cp;
private FormPanel form = new FormPanel();
private FileUpload fu = new FileUpload();
public FileUploader(ControlPanel cp) {
this.cp = cp;
this.cp.setPrimaryArea(getFileUploaderWidget());
}
@SuppressWarnings("deprecation")
public Widget getFileUploaderWidget() {
form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.setMethod(FormPanel.METHOD_POST);
// form.setAction(/* WHAT SHOULD I PUT HERE */);
VerticalPanel holder = new VerticalPanel();
fu.setName("upload");
holder.add(fu);
holder.add(new Button("Submit", new ClickHandler() {
public void onClick(ClickEvent event) {
GWT.log("You selected: " + fu.getFilename(), null);
form.submit();
}
}));
form.addSubmitHandler(new FormPanel.SubmitHandler() {
public void onSubmit(SubmitEvent event) {
if (!"".equalsIgnoreCase(fu.getFilename())) {
GWT.log("UPLOADING FILE????", null);
// NOW WHAT????
}
else{
event.cancel(); // cancel the event
}
}
});
form.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
public void onSubmitComplete(SubmitCompleteEvent event) {
Window.alert(event.getResults());
}
});
form.add(holder);
return form;
}
}
Now, what do I need to do next? What do i need to put in web.xml and how do I write my servlet so i can store file and return url of that object (if possible)
